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8 Charging circuit
Schematic
Description
E61 can charge the Li-ion/Li Polymer Battery from AC adaptor and USB, red line is the charging route
from adaptor show the route of USB, red line is the charging route from USB. While USB and adaptor
have plugged in at the same time, FP2 allows charging only from adaptor. D4 avoids charging current
flowing back to adaptor when USB is charging. Over voltage protection can be done by DZB1 and B2.
Whatever adaptor or USB is plugged in, there will be a voltage on VCHG pin, VCHG informs IOTA
adaptor or USB is plugged in and IOTA controls CHRIC by ICTL and PCHG .CHRIC, Intersil ISL 6292C
is described as below
Technical Documentation
TTD_Repair_L3 _Theory of Operation_E61_R1.0.pdf
Charging from AC Adaptor
Charging from USB
Release 1.0
06/2006
Page 33 of 33
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